Net Surface Heat Flux Balance Calculator
Reconcile separately measured surface fluxes and storage residual under downward-positive radiation/upward-positive turbulent convention; signed turbulent condensation retained, unmodeled advection may contribute residual.
Description
A surface heat budget requires explicit flux sign conventions.
A surface heat budget requires explicit flux sign conventions. Independent storage observations can expose a residual.1
Enter finite flux components in W/m² under the stated signs. Return signed net downward flux and storage-minus-surface residual.
When to use Net Surface Heat Flux Balance Calculator
Use Net Surface Heat Flux Balance Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Signed turbulent condensation is retained. Advection and other unmodeled processes can contribute to the residual.
Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
How to use Net Surface Heat Flux Balance Calculator and understand its results
- Prepare the observed lake or sample measurements and explicit calibration, reference values or thresholds requested. Keep depth coverage, units, dates and sampling conditions consistent.
- Enter downwardShortwaveWm2, downwardLongwaveWm2, upwardLongwaveWm2, upwardSensibleWm2, upwardLatentWm2, independentStorageFluxWm2 using the field table and calculation rules, then run the tool.
- Read signedNetDownwardSurfaceHeatFluxWm2, observedStorageMinusSurfaceResidualWm2. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| downwardShortwaveWm2 | Downward shortwave wm2 | number | Required |
| downwardLongwaveWm2 | Downward longwave wm2 | number | Required |
| upwardLongwaveWm2 | Upward longwave wm2 | number | Required |
| upwardSensibleWm2 | Upward sensible wm2 | number | Required |
| upwardLatentWm2 | Upward latent wm2 | number | Required |
| independentStorageFluxWm2 | Independent storage flux wm2 | number | Required |
Enter finite flux components in W/m² under the stated signs. Return signed net downward flux and storage-minus-surface residual.
netDown=shortwaveDown+longwaveDown−longwaveUp−sensibleUp−latentUp; residual=storage−netDown Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| signedNetDownwardSurfaceHeatFluxWm2 | Signed net downward surface heat flux wm2 | number |
| observedStorageMinusSurfaceResidualWm2 | Observed storage minus surface residual wm2 | number |
{
"input": {
"downwardShortwaveWm2": 100,
"downwardLongwaveWm2": 30,
"upwardLongwaveWm2": 50,
"upwardSensibleWm2": 10,
"upwardLatentWm2": 20,
"independentStorageFluxWm2": 40
},
"output": {
"signedNetDownwardSurfaceHeatFluxWm2": 50,
"observedStorageMinusSurfaceResidualWm2": -10
}
}Limitations and assumptions
Signed turbulent condensation is retained. Advection and other unmodeled processes can contribute to the residual.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Seasonal Heat Budget Change Calculator: Seasonal sensible-heat change compares matched fixed layer volumes before and after temperature change. Positive values indicate warming. For a complementary task, use Evaporative Cooling Flux Lake Calculator: Latent heat links a measured evaporation mass flux to cooling flux. Negative mass flux represents condensation under the declared sign.
References
-
Net Surface Heat Flux Balance Calculator — tool.io
Similar or alternative tools
- Seasonal Heat Budget Change Calculator
Seasonal sensible-heat change compares matched fixed layer volumes before and after temperature change. Positive values indicate warming.
- Evaporative Cooling Flux Lake Calculator
Latent heat links a measured evaporation mass flux to cooling flux. Negative mass flux represents condensation under the declared sign.